Frys has the Western Digital My Book Live 2TB Network Attached Storage (NAS) External Hard Drive (Black, WDBACG0020HCH-NESN) for $77 with free in-store pickup only. Goes for $100+ elsewhere. Connects to router, features automatic backup and is compatible with Apple Time Machine.

Actually a lot of the cheap ones don't, this one does work with time machine where some of the USB ones don't. The routers with USB in seem to be around 100 or more. This also has some nice NAS syncing stuff too I am sure.

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